Fluid supply circuit for active suspension system with variable fluid source discharge rate depending upon magnitude of lateral acceleration
First Claim
1. A fluid supply system for an active suspension system of a vehicle for supplying a pressurized fluid for a hollow working cylinder via a pressure control valve for adjusting suspension characteristics in order to suppress vehicular attitude changes and to absorb road shock vibration, said system comprising:
- a pressurized fluid source unit for circulating pressurized fluid through a fluid circuit extending via said pressure control valve and said working cylinder;
a first sensor means for monitoring relative displacement between the body of the vehicle and a suspension member rotatably supporting a road wheel of the vehicle for producing a relative displacement magnitude indicative signal, said pressurized fluid source unit being operable in various mutually different discharge modes at variable discharge rates of the working fluid;
a second sensor means for monitoring a lateral acceleration exerted on the vehicular body;
first means for deriving a predicted fluid flow amount through said fluid circuit on the basis of said relative displacement indicative signal to produce a predicted fluid flow amount indicative signal;
second means for detecting a magnitude of lateral acceleration greater than or equal to a predetermined acceleration criterion to produce an acceleration detection signal; and
third means for deriving a required fluid supply amount from said pressurized fluid source unit on the basis of said predicted fluid flow amount for controlling said pressurized fluid source unit in order to adjust the supply amount of fluid toward the derived fluid supply amount, said third means being responsive to said acceleration detection signal for selecting one of said variable discharge rates which satisfies said required fluid supply amount with a minimum discharge rate.
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Accused Products
Abstract
A fluid supply system is provided for an active vehicle suspension system, for supplying fluid pressure for a hollow working cylinder via a pressure control valve for adjusting suspension characteristics of the vehicle in order to suppress vehicular attitude changes and to absorb road shock vibration, the system having a pressurized fluid source unit for circulating a pressurized fluid through a fluid circuit extending via the pressure control valve and the working cylinder. A first sensor is provided for monitoring a relative displacement between the body of the vehicle and a suspension member rotatably supporting a road wheel thereof, for producing a relative displacement magnitude indicative signal. A second sensor is provided for monitoring a lateral acceleration exerted on the vehicle body. A predicted fluid flow amount through said fluid circuit is derived on the basis of the relative displacement indicative signal to produce a predicted fluid flow amount indicative signal. A magnitude of lateral acceleration greater than or equal to a predetermined acceleration criterion is detected to produce an acceleration detection signal. The fluid supply amount from the pressurized fluid source unit is derived of the basis of the predicted fluid flow amount for controlling the pressurized fluid source unit in order to adjust the supply amount of fluid toward the derived fluid supply amount in response to the acceleration detection signal for increasing the supply amount.
33 Citations
12 Claims
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1. A fluid supply system for an active suspension system of a vehicle for supplying a pressurized fluid for a hollow working cylinder via a pressure control valve for adjusting suspension characteristics in order to suppress vehicular attitude changes and to absorb road shock vibration, said system comprising:
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a pressurized fluid source unit for circulating pressurized fluid through a fluid circuit extending via said pressure control valve and said working cylinder; a first sensor means for monitoring relative displacement between the body of the vehicle and a suspension member rotatably supporting a road wheel of the vehicle for producing a relative displacement magnitude indicative signal, said pressurized fluid source unit being operable in various mutually different discharge modes at variable discharge rates of the working fluid; a second sensor means for monitoring a lateral acceleration exerted on the vehicular body; first means for deriving a predicted fluid flow amount through said fluid circuit on the basis of said relative displacement indicative signal to produce a predicted fluid flow amount indicative signal; second means for detecting a magnitude of lateral acceleration greater than or equal to a predetermined acceleration criterion to produce an acceleration detection signal; and third means for deriving a required fluid supply amount from said pressurized fluid source unit on the basis of said predicted fluid flow amount for controlling said pressurized fluid source unit in order to adjust the supply amount of fluid toward the derived fluid supply amount, said third means being responsive to said acceleration detection signal for selecting one of said variable discharge rates which satisfies said required fluid supply amount with a minimum discharge rate. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification